Forward and backward‐scanning in current‐potential domain ‐ a candidate sensor for surface galvanic strain

Abstract

Three types of alloys have been chosen, and subjected to three different varieties of macro‐strains, e.g. corrosion‐pittings in a high strength low‐alloy, sensitization‐induced precipitation in an unstabilized 304 s.s. and cold‐working stresses in FeNiMoB and FeNiMoBSi metallic glass foils for diagnostic studies in corrosion console. Attempts to correlate the galvanic activity of these substrates with the imposed galvanic micro‐strains using an entirely new type of criterion, namely the distance between the forward and backward‐scan, indicated by “d” value in terms of current at a particular chosen potential. This technique, however, is limited by a threshold extent of surface‐strains, in terms of either anodic or cathodic stress concentration‐points above which the surface either develops an anodically activated film or it starts behaving as an effective cathode. The galvanic interactions of the surface, under such conditions, become minimal so that the “d” values no longer remain an increasing function of the increasing surface galvanic strain.

Citation

Mukherjee, D., Parthiban, G.T., Muralidharan, S., Jayaperumal, D. and Srividyarajagopalan, C. (1997), "Forward and backward‐scanning in current‐potential domain ‐ a candidate sensor for surface galvanic strain", Anti-Corrosion Methods and Materials, Vol. 44 No. 5, pp. 300-307. https://doi.org/10.1108/00035599710177574